Key Control: Who Has Access to Your Home?

How many copies of your house key exist? Who has them? Are you certain?

Most people can’t answer these questions with confidence. Over years of normal life—lending to friends, giving to family, providing to tradespeople—key copies multiply. Control erodes. Security degrades invisibly.

Why Key Control Matters

The Invisible Vulnerability

Your lock may be excellent. Your door may be reinforced. But if copies of your key are circulating with people you’ve forgotten about, none of that matters.

Key control failures don’t announce themselves. You won’t know you’re vulnerable until something happens—or until you honestly count the keys.

Who Might Have Keys?

In a typical household over five years:

• Family members (some no longer living there)
• Ex-partners (possibly from relationships ago)
• Friends given emergency access
• Neighbours for pet feeding or plant watering
• Cleaners (current and previous)
• Tradespeople who needed access
• Dog walkers, nannies, carers
• Estate agents (if you ever sold or let)
• Previous owners’ contacts (who may still have copies)

Each represents a potential copy—and each copy may have been copied again.

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Every key you give away is potentially permanent access. People forget to return keys. Relationships end without formal handover. Copies beget copies.

Establishing Key Control

Step 1: Audit Current Distribution

Create a simple list:

Be honest. Include everyone you can remember. Accept that there are probably more.

Step 2: Assess Current Risk

For each key holder, ask:

• Do they still need access?
• Do I trust them completely?
• Would I know if they copied the key?
• What changed since I gave it to them?

Step 3: Recover or Replace

For each unnecessary key:

Option A: Request return

• Appropriate for ongoing relationships
• No guarantee copies weren’t made
• Polite but not definitive

Option B: Change locks

• Definitive solution
• Necessary when keys can’t be recovered
• Fresh start with documented control

The Fresh Start Approach

Sometimes the only way to establish control is to assume it’s lost and start over.

When to Reset

Consider a lock change if:

• You’ve lost track of key distribution
• Multiple people with unknown key status
• Major life changes (divorce, new property, tenant changeover)
• Any incident that suggests key misuse
• Keys lost in identifiable circumstances

The Reset Process

1. Change all exterior locks on the same day
2. Create new key inventory documenting all copies
3. Distribute minimally - only to those who genuinely need access
4. Establish new rules for future distribution

This is exactly what should happen when moving to a new property—but applies any time control has degraded.

Ongoing Key Management

The Distribution Decision

Before giving anyone a key, ask:

1. Do they genuinely need unsupervised access?
2. For how long will they need it?
3. Can alternatives work instead? (being present, smart lock, key safe)
4. Am I willing to change locks when this ends?

Record Keeping

Maintain a simple record:

• Who has keys
• When they received them
• Why they have access
• When to review (annual minimum)

Store this securely (not on a note by the keys).

Annual Review

Once a year:

• Review your key holders list
• Recover keys no longer needed
• Consider whether circumstances warrant lock change
• Update records

Restricted Key Systems

For maximum control, restricted keys prevent unauthorised copying.

How They Work

• Blanks are proprietary and not commercially available
• Copies require authorisation from the registered owner
• Dealers verify identity before cutting
• Creates a paper trail of all copies

Who Benefits

Restricted keys make most sense for:

• Those giving keys to multiple people
• Landlords with frequent tenant turnover
• Anyone wanting verification of key control
• Properties with high security requirements

The Trade-offs

Advantages:

• Complete copy control
• Authorisation required for new keys
• Paper trail of distribution
• Psychological deterrent

Disadvantages:

• Higher initial cost
• Inconvenience if you need copies urgently
• Relies on dealer compliance
• Not all systems equally secure

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Restricted keys don’t prevent someone using your key—they prevent someone copying it. Important distinction for appropriate expectations.

Alternatives to Physical Keys

Smart Locks

Replace key control with code control:

Advantages:

• Issue temporary codes
• Revoke access remotely
• See who accessed when
• No physical keys to copy

Disadvantages:

• Technical failures possible
• Battery/power dependent
• Codes can be shared
• May not meet insurance requirements

Key Safes

External lockboxes for key storage:

Best for:

• Emergency access backup
• Carer access where you control the code
• Situations where key distribution must be limited

Cautions:

• Visible to observers
• Codes can be shoulder-surfed
• Cheap safes are easily defeated
• Location matters

For secure storage guidance, see our spare key storage guide.

Being Present

The simplest alternative to giving keys:

• Be home for tradespeople
• Accompany cleaners on first visits
• Use delivery lockers instead of home delivery

Not always possible, but eliminates key distribution entirely.

Special Situations

Tenanted Properties

For landlords:

• Change locks between tenancies (non-negotiable)
• Use restricted key systems for tracking
• Document all key handovers
• Never assume tenants return all copies

Shared Households

For housemates:

• Agree on key distribution policy
• When one person leaves, consider lock change
• Keep records of who has copies
• Address lost keys. Understand the security risk of lost keys immediately

Care Situations

For those with carers:

• Minimise key holders
• Consider key safes with rotating codes
• Document all access providers
• Review when care arrangements change

When Keys Are Lost or Stolen

Assess the Risk

Immediate Actions

1. Assess how identifiable the keys are
2. Secure the property immediately if high risk
3. Report if stolen (police reference for insurance)
4. Change locks if risk warrants

For comprehensive lost key guidance, see what to do when keys are lost.

Take Action

Right now, can you list everyone who has a key to your home?

If not, key control has slipped. That’s normal—life is busy and keys distribute gradually over years. But recognising it is the first step.

Start a key holders list. Identify unnecessary distribution. Decide whether recovery is sufficient or whether a fresh start is warranted.

Your locks are only as secure as your control over who holds the keys.